Docker and transmission, can't connect to web ui

I've been using OVM for a few years and just upgraded to version 4 today from OVM 3. I'm trying to install transmission using docker and I followed the video tutorial. Everything went well until I tried accessing the transmission UI in my browser. In the video the transmission controls appear but in my browser I'm being asked for a userid and password. I tried entering the userid/password that match the PUID/PGID I entered but it didn't work. I've tried every other userid/password combination including root and admin and none of them work. Any idea what's wrong? My log file is below, I've highlighted a few lines of concern. Any help will be much appreciated.

In your settings, I see you use Host networking. Some images uses the same port by default so when you launch theses images, it will be a conflict because they can't use the same port. So, I personnally prefer to use Bridge networking because you can specify port mapping.
Moreover, if you use docker omv plugin to create a container and an error occured the container is launched but you don't see it because the window is still here so when you click on create , the error 'port already in used' occured. I think it's the case for you ?

Just verify what is using this port and kill the process or container.